MAINT: remove several outdated comments

Author: ev-br

torch_np/_ndarray.py

@@ -112,7 +112,7 @@ def astype(self, dtype):
     def copy(self, order='C'):
         if order != 'C':
             raise NotImplementedError
-        tensor = self._tensor.clone()   # XXX: clone or detach?
+        tensor = self._tensor.clone()
         return ndarray._from_tensor_and_base(tensor, None)
 
     def tolist(self):
@@ -471,7 +471,7 @@ def std(self, axis=None, dtype=None, out=None, ddof=0, keepdims=NoValue, *,
             raise NotImplementedError
 
         torch_dtype = _helpers.float_or_default(dtype, self.dtype, enforce_float=True)
-        tensor = self._tensor.to(torch_dtype)   # XXX: needed?
+        tensor = self._tensor.to(torch_dtype)
 
         result = tensor.std(dim=axis, correction=ddof)
 
@@ -484,7 +484,7 @@ def var(self, axis=None, dtype=None, out=None, ddof=0, keepdims=NoValue, *,
             raise NotImplementedError
 
         torch_dtype = _helpers.float_or_default(dtype, self.dtype, enforce_float=True)
-        tensor = self._tensor.to(torch_dtype)   # XXX: needed?
+        tensor = self._tensor.to(torch_dtype)
 
         result = tensor.var(dim=axis, correction=ddof)